Variable | No of patients | No with effusion at diagnosis (%) | Relative risk | p Value |
All patients | 200 | 50 (25) | ||
Gender | ||||
Male | 124 | 28 (23) | 0.9 | NS |
Female | 76 | 22 (29) | 1.2 | NS |
Age (years) | ||||
<60 | 28 | 7 (25) | 1.0 | NS |
60–69 | 73 | 19 (27) | 1.0 | NS |
70–79 | 64 | 15 (22) | 0.9 | NS |
>79 | 35 | 9 (26) | 1.0 | NS |
Histology | ||||
Small cell | 25 | 11 (44) | 1.8 | 0.026 |
Non-small cell | 140 | 31 (22) | 0.9 | NS |
Undifferentiated | 54 | 11 (20) | 0.8 | NS |
Squamous | 45 | 7 (16) | 0.6 | NS |
Adenocarcinoma | 38 | 13 (34) | 1.4 | NS |
Bronchoalveolar | 2 | 0 (0) | 0 | NS |
Carcinoid | 1 | 0 (0) | 0 | NS |
No histology | 35 | 8 (23) | 0.9 | NS |
Side of primary | ||||
Left | 83 | 20 (24) | 1.0 | NS |
Right | 111 | 28 (25) | 1.0 | NS |
Lobe | ||||
Upper | 115 | 25 (22) | 0.8 | NS |
Middle | 5 | 0 (0) | – | NS |
Lower | 49 | 16 (33) | 1.3 | NS |